21311010131121 has 8 divisors (see below), whose sum is σ = 31571866860960. Its totient is φ = 14207340087396.

The previous prime is 21311010131111. The next prime is 21311010131161. The reversal of 21311010131121 is 12113101011312.

21311010131121 is a `hidden beast` number, since 21 + 311 + 0 + 1 + 0 + 1 + 311 + 21 = 666.

It is not a de Polignac number, because 21311010131121 - 2¹³ = 21311010122929 is a prime.

It is a super-2 number, since 2×21311010131121² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21311010131094 and 21311010131103.

It is not an unprimeable number, because it can be changed into a prime (21311010131111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394648335735 + ... + 394648335788.

It is an arithmetic number, because the mean of its divisors is an integer number (3946483357620).

Almost surely, 2^{21311010131121} is an apocalyptic number.

It is an amenable number.

21311010131121 is a deficient number, since it is larger than the sum of its proper divisors (10260856729839).

21311010131121 is an equidigital number, since it uses as much as digits as its factorization.

21311010131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789296671532 (or 789296671526 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

Adding to 21311010131121 its reverse (12113101011312), we get a palindrome (33424111142433).

The spelling of 21311010131121 in words is "twenty-one trillion, three hundred eleven billion, ten million, one hundred thirty-one thousand, one hundred twenty-one".